7Wang X H, Chen R Z, Gui Z L, et al. Synthesis and properties of barium titanate based X7R ceramics by chemical method. Ferroelectric,2001. 262:251 -256.
8Wen H, Wang X H, Li L T, et al. Properties of Sr - doped BaTiO3 based X7R ceramics materials. Key Eng Mater, 2005, 280 - 283:65 - 67.
9Li L T, Gui Z L. Fabrication of low-firing piezoelectric ceramics and their applications. Ferroelectrics, 2001, 262:3 - 10.
10Hu X B, Li L T, Chu X C, et al. Analysis and measurement of the vibrations of multilayer piezoelectric transformer. Key Eng Mater,2002, 224(2): 125 - 128.